That comes from L. Sprague de Camp and Lin Carter's short story "Red Moon of Zembabwei" as found in the Ace/Lancer volume Conan of Aquilonia
. The copy I have even has a Boris-painted cover featuring King Conan, Conn and a wyvern.
The short story was written in 1977, which was the year AD&D was introduced and about 3 years after the basic game concepts were introduced. I don't know for sure, but I doubt de Camp or Carter played D&D, so I don't think it was D&D influenced. Real-life ruins in RL Zimbabwe feature winged reptiles in some artwork, so that is probably where de Camp and Carter got their inspiration.
If you go HERE
and look toward the bottom at #39, you can see a thumbnail of the cover.