SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1af6fff0881216d0d9a3b8deb30005792def104d5e43b3a9dbf8a298a53cb6c6' 
  AND token = 'reeZwB0iBRIxvznhq+sURYX+PWck/MBLPSrk7Y4yG2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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