SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4599af2ec99c58f648e948bcf947ccb055e73f050ba8c3cb3f13296da72ab88' 
  AND token = 'U7o35mHtJYVvMGaWtK+lZeY2vheJOEQgLAgEBrKdags=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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