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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04a0ee245b33a1428b2af7b9bbe4d514ed4662d9a3ce8f1066b63d9739ed02cf' 
  AND token = 'hHk0oKRCpiK0aEfx+UfWue+aQqKVM7ImSK5HnoXDVfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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