SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '669ac15544f31a05a537e1ef35d2f78386539fd24d5de0d11f95043b2c13fa35' 
  AND token = 'UnxjsY2zZkPCjuIaO/0Z8R+zvVipz56z9lWowOl8rbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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