Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8942508f3f77bc762d546ed5588829de8282b12aa6498e6af476eea1ffbf578' 
  AND token = 'Qx7jLqfGMUIEfsAcSEXtSG56HxQDdeNIJGXFBBENpws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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