SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc609996cb842a798d70d9cf5e476d2011339f376f0253d3e37bc782ae4b2188' 
  AND token = '/Zurko+pnQeoDC9aKvTXWvno0yclu0qMhBFiUp9RgK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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