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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18419b5e1ccd2d598d7492cb59a372a1e781bbe8d221c52ca3c186dc54845b7f' 
  AND token = 'I1pkBCfXeWfwD1w/pZf3k12Pc6w4cB3ZuGIw31TeCLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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