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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c63c0422cc8692830fc97e86847426db0e21c2bb28a414ddf3010fe9f7b2d7d7' 
  AND token = 'p41OUhkLE9guqGVku23wH16r3rUMSnyWayJD6yrJWdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}