SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '040b46e11f8a6c672ce3bfc4d7055b58139b31632499a627fd504c7d0fd82c03' 
  AND token = 'jB8LHIwUmHuQ64FZO8Hb10T/wbt6qKakQQoEg93Vy+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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