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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9ca8a70600b34b7fc8ad85b89b66e9990b04fa3ca48d194d040990d527cb320' 
  AND token = 'Ems1nPvxOftc3iWtYqIFYfO1TN71RgXtdNqjG+S29MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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