SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '075e63f49aa553b51ed76d2ed56010b561355018d0ef1c78cef38ac1c323042b' 
  AND token = 'WCBTGhCEuNHlbtI+HK4qhATQvTWZoO0CNzZ6/eMXpww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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