Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42e8ced657a97c71a0b27e355b172e82d35d644c4bf9d4b8f5184244acb23a96' 
  AND token = 'o5Lc7vk763TQdXFhJytDnda8JqDiOnSMOqhlNh/ph2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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