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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c714b5e21658ad809840b660e1b6c5f0ee94cca56813301d919380845939fda' 
  AND token = 'gFyMFTj4h1aLHuew+RWf2hZd/+YM4wxC8/0CcD3nDdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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