SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ab96784f5413b22fcb9adcd58be33ef51e19564415537f49c077dbdf44f15b5' 
  AND token = 'E39Egt7vI3aOt/CVYL3HxpHLmTUyzx4QQGtiqBbyw60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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