SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6297b88919cdcd138e6fa62562a7514256b054161774006d0f463b7a92439bb' 
  AND token = 'OXzVsZ+LXpXdjujHRh5m+QUIu0YeOvxoGishmcdKA00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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