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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52f53e4398ecb18d9d8ee8ca127988edd91d2ae5612cdb9634f85ee73f315f96' 
  AND token = 'YqP+XMWUhxrmmPZJGRNNYYzbhqXivuf3NNachTtD6Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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