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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71bbd9e687b3309e940ff7ea03798bf609ec905c82dc50cb11d2cfa275a90406' 
  AND token = 'pBt4XUbdGDdDI8TZGMv2dI8m+xI01EyKH8+vq+PHn8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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