SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24b9c6cf3cfecbd2ef2e79ec569493ddd35d884968bdb9c3ce8e57727f0c9883' 
  AND token = '3w91QgDGiuertSHjWSIPO5spCKzBqMyyF539wnLJUcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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