SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a27b3de4e901524165c31e5df633cae5891cb2311475fc3aa6786675c3dc80af' 
  AND token = 'nwj/bogWOt3hCN0Sv9rXVXaayukzhoovY+P/4ZiXYdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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