SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3eb6a4756a125ee177089d2bea89913aa7ae6d1d5ce3f4f356e8327f562d7ea9' 
  AND token = '7jsmCcXVv2CzsK9DHwURfQXoYL2wius1X8pzu+0ZFxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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