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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '956bfd28ba1a5b914e1f46c062ada744c1c5a3cec553baa376b4969f2e6af83d' 
  AND token = 'TcRmBjc4ybJSWbm47M6g6+ilIGQO9hKz6lrc2bapWOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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