SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8a29c649933a698c5d17b10cbfe578ce64ed6583115f39b2772c82a9ffac828' 
  AND token = 'uas8b6zmBLpDqoqmKYHjHkK1xNx8v5d8XmX/9c7auhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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