SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '442c3b9f50ecf6ed17cc247ab1497bf20a9971096b2f35d30af5267d8a745b32' 
  AND token = '5gxCoNcV0PxRWWo4q+EwYjvTmTzm9uclzfiF5PgULf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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