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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9850b7d9e840fc54dca5d69d62150520de2d9cf7e62a31be69afa792d5df9002' 
  AND token = 'lkXDxbLGo8UWjRA1yv04+qkTyI7tHvSuuJcZ6ex9kHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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