Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bb6c78bef73dfb63f91d414f3469a8e977bf0f0b4a4f8dc0e29e8d7add546d8' 
  AND token = 'HnNURvFEbIqx4u/PYDiCorB3UIf3DnD9YGNuBvUyP8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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