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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9c70cb3dc0239abe45600ad33a8271f29a56f6239f82bdeca847e9b4a08e8d7' 
  AND token = 'TFjdJ2Ce7JuX3xYYuxokJQF8H2FSOm7/io3GGfjfGtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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