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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '912433485863f601e0cf501726fbe202b037395eaa187f46f7be9caf8271c84a' 
  AND token = 'N34Xa5TXrAnSV3lVLeMw2CxNEwIKKfe3i/zYh9RxhH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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