SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e9c14622d01fb5d7f954d58cfc394bdee90109898f82e9d181f0d94eca9876e' 
  AND token = 'g0/zUtKxlW3gblYOHaH0cnWeXKoSZ3dyCL7VGJ3lSJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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