SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9cc820fde7d1f52c9e487c84156ec4a03b7c6de1f9cbf918b86ba3852f92673' 
  AND token = 'xbIuDXJGvLeKQ0ALSshNNVytNThYkyZrHL+g32dlTpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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