SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29fb929ee1d19442320d03b371f9e7b3862f804ed4891e64c71e4fdec1f3e685' 
  AND token = '4dBF/GMnCKSBsPYu1XcgCdap5UiYjp6fpIZL6QlthIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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