From their README

Alfred Emoji Picker

  1. Install the latest version of this extension from the Releases page.
  2. Type emoji [thing you want to find]

Skin tone modifier support

By default, emoji that support skin tone (fitzpatrick) modifiers will default to no modifier. To pick an emoji with fitzpatrick modifier, add -t[1-5] to the end of your query. For emoji that accept more than one fitzpatrick modifier, you can specify multiple digits:

GIF example of Fitzpatrick modifier support