I had my Associate's in Microbiology & Physics. It didn't matter at all what the AS was in. If it wasn't a Bachelor's degree, they weren't interested in it. The only thing the AS helped me with was satisfying the credits for humanities, social science & communications that needed to be completed along with pre-reqs. Because my degrees were earned 19 years ago, even my Microbiology credits weren't accepted. I had to re-take Micro for nursing pre-reqs. It was an easy A the 2nd time around, but a big waste of time!
Yes, you could potentially get a job in a lab with an AS, but you could do the same thing with a certificate as well. Entry level lab jobs don't pay that much and the hospital labs in our area have hybrid lab tech/phlebotomy roles. The only lab clerk we had that didn't have phlebotomy was a histotechnician who had a special certificate in histotechnology, which was a 2 year program (no AS granted).
So, yes, it'll help you get a job, but I wouldn't count on it making a difference when applying to nursing school.