SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c88443b334a3818fb84c823f6ae9c182b486af3e323d941773215179368f59b' 
  AND token = 'VqUZRTVJBIy1y4L1uH9W11Ad8PpNM5a/5/GiKlmD+uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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