I have a bunch of seeds from hybrids I created last year. They have been in my fridge for almost a year. Is there any time limit on how long I can keep them refrigerated, or should I just take them out and store them elsewhere?

Storing dry seeds in the fridge prolongs their storage life so I would leave them there. If they've been hydrated and in the fridge (stratified) then the best thing to do is plant them.

I guess there is not much moisture in what ever they are stored in or they would have probably sprouted by now.

They can be good for several years, I had seed buyers tell me they started seedlings from 4 year old seed.
I read post from others saying that germination are reduced each passing year and the 4 plus year old seed are at 50% or less success.
I've never kept seeds longer than 2 years myself, so I can only tell what people tell me.
As long as those seeds are still firm some should be good to go.