SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59d695eb8b6ca6e804b73b5a0040bf4f83fec318e01ab8c30d4cf5fe817141b2' 
  AND token = 'rvMO3wi/ZwnCTUY2xBjfK8BhC9ss/U5tT1LVuYGB8es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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