On my 1st attempt to find a desert temple with a god apple in it I entered the seed 6578689612441510701
I used /locate to find the nearest temple and you won't believe what I found!
At the coordinates: -1205 65 1226
I found a temple with a god apple and 3 normal golden apples.
Test it for yourself, It's true!
Here's an image of the chest with the god apple in it.