[tardigr8]

Your question is "Is it ok?" rather than "Is it legal?".

Assuming you have checked the legality of this hiring criteria in your country/state...

I think it is ok, I live in a country with very little regulation, by choice mainly.

I think it is ok because your job ad will be up front and honest. If you provide context (e.g. you are hiring for sensitive counseling position dealing with specific issues), you can speed up the hiring process.

If you provide no context, a good assumption is that your company has some sort of bias, and potential applicants can speed up their job search by skipping yours. It's a time waster to find out about that bias during the interview process, or worse, during your employment.