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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7749bed5bc9be98b56be9d368493ffad77d20ff84128278856a6bbec2086949d' 
  AND token = 'V/cQLf+I4D9dWGljwWDOIyD3A4DE69tnT++zFoTlE4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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