SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b85ec8010129f8e752a7f664d799a4e482fc04ef005f78dc1f8009d7a0f905d2' 
  AND token = 'JtKHZArOp8/C7U+1WCsjHJTKkSdVB9kkfqEuBCfwFvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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