I taught for Hyperlearning for a while and they didn't have any minimum score requirement. But everyone who was hired and had an MCAT score had done pretty well. I seriously think they care about teaching more than the score, because a good score does not mean you can teach well. Knock them dead at the interview and they will love you.
I occassionally get "recruited" to teach, because I'll tutor one of their students and the student says something to PR. I think they just try to get as many applicants as possible to increase the chances of getting a good teacher. In this area, they have a bunch of undergraduates teaching, as does Kaplan. I don't think they care about academic credentials.
Good luck getting hired. Just to toss the number out there, when I taught, the salary range was $18 to $27.50 an hour, depending on experience. What does it pay nowadays?