SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '569018c2b4e36abef3a10574a1aa2377cf638604395c17b8fe70f54521741888' 
  AND token = 'f7jup5dXoAa9USDlpWwhlEzZ0oMWY8fLBdJrXUFhvOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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