Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9bdfbaa08d2423c3cde52f22e76504a85a7b16892fb4492e9cc8cf8e9cb10af4' 
  AND token = 'u/6aOAmdV14yzItiRNTMemb5eD5QNL/QpS+sFF5CEEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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