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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc0066da40c361cedc8ba841022df5e34238b3eeba8ba8dc0a96d4144f50e150' 
  AND token = '27JFyNTfsf/4zqMySMA1yzfHbbt+OQDQAdauHuC/0wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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