SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26d57331f12a1f81d2871b4c3e1fa39267d84e1c7e5d527cd048882c42553fe5' 
  AND token = 'XCAOnYRVzVlqZBjC9m2BrK2dBQ5qLk8lTXDnNef8+8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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