Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b39fae92045251dd5f20375e8d1ae4e7e9368333475fee84e408417d4fd23237' 
  AND token = 'TQkYteCodrEjC7YqEnvshbna+9XdpJt/9zmIDQl0J2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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