Why not go for one of the extinct dragonflies: [Meganisoptera](https://en.wikipedia.org/wiki/Meganisoptera) had a wingspan of 71 cm (28") and was a predator just like today's...

All predators have more than moderate mental aptitude anyway, so pushing the limit a bit wouldn't be too hard...

[![enter image description here][1]][1]

*Source:* linked Wikipedia article.

**Edit:** An IQ of 90 or above would mean a lot of handwavium as a higher IQ needs both a larger energy intake and external stimuli:

* Higher oxygen content of the atmosphere
* Parallel evolution where they became an apex predator:
   * they learnt how to capture small birds, [flying fish](https://en.wikipedia.org/wiki/Flying_fish), ...
   * Learnt to live in social groups like bees
   * ...
* And depending on your universe: *Magic can do anything...*

  [1]: https://i.sstatic.net/8h6Yg.jpg