Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3897d12e56a7e4d6599c9ec2e9ef8b6e1f7256ef325ad8997ba8d65cea6eb15d' 
  AND token = 'Ca1f3r0jqCZ55GY2KhsckYbi8lp/wuYrx+CkTg04/d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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