SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47886f14d4fa68c8da42f99dbf2ad11652ff10129a6597ab4af3795be62c2e81' 
  AND token = 'xlmBXwknBNIIi5wkPdzq5/gecM4Q0vIbPLsWUY3esPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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