I don't remember there being a level req if you had a key.. It may have been 46 if it existed at all.
I found this post from right around when Kunark came out.. if you check the sig of the poster, they were only level 48..
http://www.eqclerics.org/forums/showthread.php?t=7890
Edit: One thing I don't remember is when they implemented "soulbound" to the idol...