SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '182ad93675fbb65a596961b71e6d432a07c692682673985e9f87b487d1580f95' 
  AND token = 'B9w0W6n3gw+X14wxEqAJ3qsBi4KcLBEzV6kLXDyGuHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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