SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed930b9c6fe1b342421260b80c7670f3a0c21596522819fe4db31dbd16be8f29' 
  AND token = 'SuWrLjO7JwgXD2AbXAhLwBkc1VSbKbiYjZ0lOjTZzo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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