SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d0ef514357136be4b8fc065cbc2bfe29458df13262889b4a7efb705c98f0c8f' 
  AND token = 'fjEhsu5MQ6WdEOUQh5gVjkQW1ZIPJHWClzxzEgvbOzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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