SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfc0660c7a7685111861748c94fd2750e13ef7493fb219f8076e463b73fa9c1b' 
  AND token = 'PV2f7b/3CJOSmrzLp7dwZu7U5sNMHMWqti+LfiLxPuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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