SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6476534bcd3c2bb8c338a2dd0957dd8051b2f9f34e7ec3ea7e1e6eabb2e8ae7f' 
  AND token = 'Ex9g+k+FKgIhjo9SQd1bnGVaKmVNSlZVH1/YnFNjxnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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