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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddff2e570f960167be1fb01042b0925cd1e733c347ffe4942f6df0b80015e9c4' 
  AND token = 'FOWy1qPO7MQBgH93ZGIZ6R1V7yD1B4aFTl+l9qntN3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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