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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a2309a178406bcbd5cf8ec7c1fb1b31163091a43492eb0df41ca95831279808' 
  AND token = 'jBYpqdlhICeVEMTNtv9Wjfq7WRnZdU8r9TP9uE0NsRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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