I believe your goal is as follows.

• You want to convert the following python script to Google Apps Script.

    import requests
  
    url = "https://api.aiforthai.in.th/ssense"
  
    text = 'Have a good day'
  
    params = {'text':text}
  
    headers = {
        'Apikey': "xxx-xxx-xxx"
        }
  
    response = requests.get(url, headers=headers, params=params)
  
    print(response.json())
  

• You have already been confirmed that your python script worked fine.

When I saw your python script, text is sent as the query parameter. In this case, how about the folloiwng modification?

Modified script:

function call_api2() {
  var text = "Have a good day";
  var url = `https://api.aiforthai.in.th/ssense?text=${encodeURIComponent(text)}`;
  var apiKey = "xxx-xxx-xxx";
  var response = UrlFetchApp.fetch(
    url,
    { "headers": { "Apikey": apiKey } }
  );
  Logger.log(response.getContentText());
}

Note:

• If you test the above modified script, when an error occurs, please confirm your apiKey again.
• If an error like status code 403 occurs, your URL might not be able to be requested from Google side. I'm worried about this.

Try this instead:

function call_api() {
  var url = "https://api.aiforthai.in.th/ssense";

  var apiKey = "xxx-xxx-xxx";

  var response = UrlFetchApp.fetch(
    url,
    {
      "method" : "GET",
      "headers" : {
        "Apikey" : apiKey,
        "text" : "Have a good day"
      }
    }
  );
  Logger.log(response)
}

You can check out the UrlFetchApp documentation for future reference.