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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e65f8d1dc2c6688b9c733af6ef0c107ec37cb28412e3a77a698c29a3d5da7fc' 
  AND token = 'JbrYUZWlwK2l6hrKtKQibbNsyi2Zb7xTTBm+9eNJg3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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