SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5457ed90c0c96e97c93eac675858541dd1ea4c6908c237f83e050898f6b7db71' 
  AND token = '95+ti461QJuSJhLgjzd6IDMna4FBAwfMP+v8jFaGpUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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