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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c20879145f773784ada01a889f39076d121a24c6492fb5f495eca13e6ec69a5' 
  AND token = 'hHKpns87YtAtaSSbUtp62Uf0VuSlwhW+5flnP5bQdZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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